Band-saw guide.



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BAND; SMN,- GIUSIDE.

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(No, Madam No. 662,254. Patented Nov.' 20, |900.

A. CUNNINGHAM.

y BAND SAW GUIDE.

(Application filed Aug. 27, 1900;)

3 Sheets-Sheet 2.

(No Model.)

No. 662.254*g Patented Nov. 20. |900.

A. CUNNINGHAM.

BAND SAW GUIDE.

(Applica-tion filed Aug. 27, 1900.) (No Model.) 3 Sheets-Sheet 3.

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'time l ATENT OFFICE.

ALBERT CUNNINGHAM, OF MILWAUKEE, VISCONSIN, ASSIGNOR TO THE FILER da S'IOWELL COMPANY, OF VISOONSIN.

BAN D-SAW G UIDE.

SPECIFICATION forming part of Letters Patent No. 662,254, dated November 20, 1900.

Application led August 27. 1900. Serial No. 28,120. (No model.)

To all whom, it may concern.-

Be it known that ALBERT CUNNINGHAM, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Band-Saw Guides, of which the following is a specification, reference being had to the accompany* ing drawings, forming a part thereof.

The main objects of my invention are to facilitate separating the opposing jaws of the guide for the purpose of affording access to the working faces of the jaws, to adapt the parts of the guide to either a right or left mill, and generally to improve the construction and operation of saw-guides of the class to which my invention relates.

It consists in certain novel features in the construction and arrangement of parts, as hereinafter described, and pointed out in the claims.

In the accompanying drawings like letters designate the same parts in the several figures.

Figure lis a front elevation of my improved guide,with a portion of the lower band-wheel, wheel-guard, and base or frame, certain parts of the guide and its adjuncts being broken away-and shown in section. Fig. 2 is a side elevation of the guide and associated parts of a band-saw mill. Fig. 3 is a plan View. Fig. 4 is a vertical cross-section of the guide on the line it 4, Fig. 3. Fig.k 5 is a similar section on the line 5 5, Fig. 3; and Fig. 6 isa vertical longitudinal section of the guide on the line 6 6, Fig. 4.

Referring to Fig. l, A is a portion of the lower band-wheel, B a portion of the wheel guard -or housing, and O a portion of the base 0r frame of a mill, in connection with which my improved saw-guide is shown.

Referring to the remaining figures of the drawings in connection with Fig. l, D is a vertically-adj ustable bracket attached to the base or frame C by means of bolts d, the heads of which engage with vertical undercut grooves c in the base C, as shown in Figs. 2, 3, and 4L. E is a block, constituting the base of the guide, mounted upon the bracket D and adjustable horizontally toward and from the back of the saw F. It is secured in place on said bracket by bolts e, the heads of which engage with an undercut groove in said block E, as shown in Figs. l and 2. The block E is formed or provided with an arm G, projecting horizontally therefrom outside of the saw F. To the upper side of this arm are bolted holders I'I I'I, having dovetailed or undercut groovesin theirinner vertical faces, and bearing-blocks I I, of Babbitt metal or other suitable material, inserted in said grooves. A series of bolt-holes is formed in this arm, as shown in Fig. 3, so that the rear holder and bearing-block may be set forward or back for saws of different widths. The block E is formed, as shown in Figs. 4 and 6, with a cylindrical opening parallel with the arm G. In this opening is fitted the cylindrical shank of an arm J, which, like the arm G, is provided with holders and bearingblocks H and I, arranged directly opposite those on said arm G, as shown in Fig. 3. The arm G, with its holders and bearingblocksconstitutes the fixed jaw,and the arm J, with its holders and bearing-blocks, constitutes the movable jaw of the guide. The arm J is formed or provided at its front end with an u pwardly-projecting crank-arm K and is provided with two pins k and lo', the pin k being in line with the axis of the shank of said arm J. Theshank of the arm J is adapted to turn freely in the block E and is retained therein by a pin The pin 7c is adjustably connected by a link L with the front side of the wheel-guard B, as shown in Figs. l and 3, and the pin la is connected by atogglelever M with the link L, so that when the members of the toggle-lever are carried into line with each other or slightly past a straight line, as shown by full lines in Fig. l, the bearing-blocks on the arm J lwill be moved toward the opposing blocks on the arm G into and locked in working position, and when the toggle-lever is bent upwardly, as indicated by dotted lines in Fig. l, the opposing bearing-blocks will be separated, as shown in Fig. 5. The link L is secured to the wheel-guard by a bolt Z, passing through a vertical slot in the link and a horizontal slot in the wheel-guard, so that said link may be moved endwise and up and down on the wheel-guard, according to the adjust` IOO ment of the guide. Said link is adjusted endwise by a bolt Z', threaded in one end thereof and bearing against a lug b on the wheel-guard. One member of the toggle-le ver is extended beyond its pivot connection with the other and provided with a handle m, and it is also formed or provided with a cross-piece m', which by engagement with a projection on the link L serves as a stop to limit the downward movement of the togglelever in position to lock and hold the movable jaw J in Working position, as shown in Fig. l.

To protect the inner movable jaw and its connections from sawdust, splinters, dac., which would otherwise be carried down upon it by the saw and tend to clog and obstruct the guide, a shield or cover N is hinged to a plate O, attached by a bolt o to the baseblock E of the guide. When this shield or cover is turned down into horizontal position, as shown, it protects the inner jaw of the guide; but when it is thrown upward and backward upon its hinge the underlying parts are exposed and readily accessible.

To adapt the guide to either right or left mills, the base-block E is formed with undercut grooves in its top and bottom faces, so that it may be reversed or inverted. The hinge-plate O is formed with two sets of ears, which not only make it reversible, but serve both for hinging the cover N thereto and for stopping and holding the cover in a horizontal position, as shown in Fig. 2, the pivot-pin passing through one pair of ears and the cover resting upon the other pair. The arm J is provided with two longitudinal rows ot' holes for attaching the holders I-I thereto, so that the position of said holders may be reversed when the position of the arm itself is reversed. In short, all the parts of the guide are so constructed that they may be reversed and employed either in a right or left guide.

In the operation of band-saw mills splinters and pieces of bark are frequently drawn by the saw into the guide between the faces of the saw and the jaws of the guide, thus producing friction, which heats the saw-blade and causes it to expand unequally and run so imperfectly that it cannot be used in that condition. Vhen this occurs, it is necessary to separate the jaws of the guide sufficiently to remove the obstruction wedged between them and the saw. To do this, as guides of this kind have heretofore been constructed it has been necessary to remove or loosen bolts and draw the bearing-blocks away from the saw-blade and then after the obstruction had been removed to readjust the bearingblocks, which necessitated stopping the mill and involved considerable trouble and loss oi' time. With my improved construction the jaws of the guide can be easily and quickly separated and obstructions removed therefrom, and after such obstructions have been removed the movable jaw, with its bearingblocks, can be immediately restored to its original working position without change in the adjustment of the guide and without stopping` the mill. By this means great trouble and annoyance are avoided and time is saved.

The reversible feature of` my improved guide is also an item of convenience and advantage in that it avoids unnecessary multiplication of patterns and castings, the several component parts of the guide being reversible and equally adapted to a right or left mill.

Various changes in minor details of construction and arrangement of parts maybe made within the principle and intended scope of my invention.

I claiml. In a band-saw guide the combination of two jaws adapted to embrace the saw and hold it in Working position, one of said jaws being pivotally connected with and movable toward and from the other, and a toggle-lever connecting said pivoted jaw with the frame and adapted when bent to separate the jaws and when straightened to bring them together-and to lock the movable jaw in working position, substan tially as and for the purposes set forth.

2. In a band-saw guide the combination of a base-block formed or provided with a fixed jaw, a movable jaw fitted to turn at one end in a corresponding hole in said block parallel with the working faces of the jaws, and a toggle-lever connecting a crank-arm on the movable jaw with a stationary support, substantially as and for the purposes set forth.

3. In a band-saw guide the combination of a base-block pro vided with a fixed arm, a movable arm fitted to turn at one end in said baseblock parallel with the fixed arm, and provided at the other end with two pivot-pins, one of which is in the same axial line with the bearing of said movable arm, a link connecting the axial pivot-pin with a fixed support, a toggle-lever connectingr the other pivot-pin with said link, and bearing-blocks mounted opposite each other upon said arms, substantially as and for the purposes set forth.

4. In aband-saw guide the combination of a vertically-adj ustable bracket mounted on the mill-frame, a horizontally-adjustable baseblock mounted on said bracket and provided with a fixed arm, a movable arm tted to turn at one end in said base-block parallel with said fixed arm and provided at the other end with pivot-pins one of which is in the axial line on which said arm turns, a link pivoted at one end on the axial pin and having a vertically and longitudinally adjustable connection at the other end with the mill-frame, a togglelever connecting the other pivot-pin with said link, and bearing-blocks mounted opposite eachother upon said fixed and movable arms, substantially as and for the purposes set forth.

5. In a saw-guide the combination of abaseblock provided with a fixed arm, a movable arm fitted at one end to turn in said base-block parallel with said fixed arm and provided at the other end with pivot-pins one of which is IOO IIO

in the axial line of said movable arm, a link for connecting the axial pivot-pin with the mill-frame,a toggle-lever connecting` the other pivot-pin With said link, and bearing-blocks detach ably mounted opposite each other upon said fixed and movable arms, the several parts of the guide being reversible and adapted either to a right or to a left mill, substantially as and for the purposes set forth.

6. In a saw-guide the combination of abaseblock having a fixed arm, a movable arm fitted to turn at one end in said base-block parallel with said fixed arm and provided at the other end with two pivot-pins one of which is in the axial line of said movable arm, a link for conneeting the axial pivot-pin With the mill frame, a toggle-lever connecting the other pivot-pin with said link, bearing blocks mounted opposite each other upon said arms, and a shield hinged at one end upon said basebloek and adapted when turned down to cover and protect the movable arm and When turned up to expose the same, substantially as and for the purposes set forth.

7. In a saw-guide the combination of a base` block havin g a fixed arm and undercut grooves in opposite faces parallel With said arm and adapted to be secured to the mill-frame by a bolt engaged with the under grooves, a movable arm tted at one end to turn in said baseblook parallel with the xed arm and provided at the other end with a crank, detachable bearing-blocks mounted opposite each other on said arms, a toggle-lever for connecting the crank on the movable arm with the mill-frame and turning said movable arm to separate the opposing' bearing-blocks and for locking the movable arm in Working position, a hingeplate secured to said base-blookby a bolt engaged with the upper groove therein, and a shield hinged to said plate and adapted when turned down to eover the movable arm, substantially as and for the purposes set forth.

In Witness whereof I hereto affix my signature in presence of two witnesses.

ALBERT CUNNINGHAM.

Witnesses:

HERBERT L. RoLoFF, CHAS. L. Goss. 

